121855039 has 8 divisors (see below), whose sum is σ = 123872112. Its totient is φ = 119851200.

The previous prime is 121855033. The next prime is 121855043. The reversal of 121855039 is 930558121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121855039 - 2⁹ = 121854527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121854995 and 121855013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121855033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16189 + ... + 22489.

It is an arithmetic number, because the mean of its divisors is an integer number (15484014).

Almost surely, 2^121855039 is an apocalyptic number.

121855039 is a deficient number, since it is larger than the sum of its proper divisors (2017073).

121855039 is an equidigital number, since it uses as much as digits as its factorization.

121855039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6617.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 121855039 is about 11038.7969906145. The cubic root of 121855039 is about 495.7710514965.

The spelling of 121855039 in words is "one hundred twenty-one million, eight hundred fifty-five thousand, thirty-nine".